Tuyere block



'Jail 26., 1943. c. E. HARRISON V 2,309,450

, TUYERE BLOCK original Filed'Jan. es,y 195e 56 5.2 A9, ff

I LWIT'ITEJR ELu-Fmm HARREUN Patented Jan. 26, 1943 toV American Engineering Company, Philadelphia, Pa., a corporation of Pennsylvania Original application January 6, 1938, Serial No. 183,609. Divided and this application August 24, 1940, Serial No. 354,071

4 Claims.

This invention relates to tuyre blocks employed in stoker furnaces, this application being a division of my `pending application Ser. No. 183,609, filed January 6, 1938.

One object of the present invention is to pro- `vide a generally improved tuyre block which is so constructed that draft air discharges therefrom at relatively low velocities. By the use of these tuyre block constructions the fuel bed is maintained normally uniform under all conditions of operation, since blowing of the fuel is prevented even when thin or extremely porous spots develop therein.

A more specific object is to provide in or adjacent the various 4passages of a tuyre block certain obstructions which tend to reduce the velocity of the air passing therethrough. By the provision of these obstructions the air passing through the various passages is compelled to follow tortuous paths. Eddy currentsare also producedwhich tend to counteract the ow of air through the various passages. The effectiveness of this construction becomes vprogres-- sively greater as the velocity of the air increases. Accordingly, as the fuel bed resistance decreases due to the `development of thin or porous spots in the fuel bed the obstructions in the passages prevent an onrush of -air to such portions of the fuel bed,=and as a result thefuel kfeeding elements are given the opportunity to build them up to a normal condition before damage occurs to the grates.

Other and further objects will become -apparent as the description of the invention progresses.

Of the drawing:

Fig. 1 is a plan View ofthe under side of the tuyre block comprisingthe present invention.

Fig. 2 is a sectional view showing several tuyre blocks assembled in position, said view being taken substantially along line 2-2 of Fig. 1.

Referring to the drawing, each tuyre block 3 consists of a relatively flat body portion I3, having a substantially rectangular air inlet end I4 and a rounded discharge or nose end I5. The upper surface of the body portion I3 comprises a relatively smooth at surface I6 which terminates at the nose end thereof in a slightly beveled portion I'I. Depending from the opposite sides of body portion I3 are a pair of supporting members I8 and I9 which terminate at their forward or right hand ends in inclined portions and 2I respectively, and which in assembly rest upon the side plates of the Stoker in a well known fashion. A pair of ribs 23 extend toward the front or .right hand end of tuyre block 3 from a point disposed on the longitudinal center line thereof near the discharge end I5. These ribs 23 diverge toward the right hand end of the tuyre block and terminate in an arcuate rib 24. Arcuate rib 24 and diverging ribs -23 form a substantially streamline abutment forthe incoming draft air and also form with the .arcuate inner surfaces 25 and 26 of members I8 and I9 a pair of inlet passages 2l Aand 28. vA strengthening rib 29 extends between the forward ends of ribs 23. A hook 30 Vis provided in the space dened .by ribs 23 and 29 and asubstantially rectangular recess 32 is provided to vthe right of hook 30,-which in assembly is adapted toreceive .the

locking hook 30 of the next 4.adjacent block of the series, as shown in Fig. 2.

A series of relatively long ribs 33 extend substantially from the inlet passages 21 and 23 to .points disposed near the extreme end portion I5 thereby subdividing the passages .into a series of smaller passages. -A series of shorter ribs 34 are disposed in the passages .defined by ribs 33 thereby subdividing said last 'mentioned passages into a series Vofrsmaller passages. The front or right hand ends of lribs 33 terminate in extended portions `'44, .as shown more particularly in Fig. 1. Each portion 44 is formed with .a concave surface 45v which acts as a deector for the incoming draft air. Mounted adjacent the right hand ends of portions 44 of ribs 33 and in spaced relation therewith are a series of .abutment members 4'I. Abutrnent members 41 are transverselyspaced and lie adjacent the' curved projections 48 and 49, extending inwardly Vfrom supporting members I8 and I9 and ribs `'23 respectively. Abutment members 4'I and projections 48 and 49 fform streamline abutmentsifor the incoming draft air andare laterally spaced so as to form passages 50 therebetween for the incoming draft air. The left hand sides of abutment members 41 are of concave construction, as shown at 5I, forming re-` cesses for the air deflected by the concave surfaces 45 of portions 44. The left hand sides of projections 48 and 49 are also of concave construction as shown at 52 and 53, and also provide recesses for the draft air deflected by the concave surfaces 45 adjacent thereto. The extended portions 44 of ribs 33 are laterally spaced forming inlet passages 54 therebetween for draft air. The ends of the extended portions 44 adjacent supporting members I8 and I9 are also slightly spaced from the inner sides of said supporting members to form passages 55 and 55 therebetween. The same is true of the extended portions 44 disposed adjacent ribs 23,

they being slightly spaced therefrom to provide inlet passages l.` Y

From the foregoing'description it is seen that draft air passes through the passages 50 disposed between the abutments 41 and projections 48 and 49. This air impinges against the concave surfaces 45 of portions 44 and is then deflected into the recesses formed by the concave portions 45, 52 and 53 and then discharges through inlet passages 54, 55, 56 and 51`and thence into the passages defined by the ribs 33 and 34 proper. By this construction it will be observed that as the fuel bed resistance decreases thereby tending to induce a higher velocity of the air through the various passages the construction heretofore described deflects the air thereby causing turbulence therein before the air can discharge from the tuyre block. As a result the velocity of the air will be greatly reduced as it discharges from the tuyre block. It will also be noted that the passages defined by the ribs 33 and 34 diverge as they approach the discharge end of the tuyre block. This also causes a reduction in the velocity of the air as it approaches the discharge end of the tuyre block.

From the foregoing description it is apparent that the present construction functions to maintain the velocity of the air within safe limits, and accordingly blowing of the fuel and damage to the tuyre blocks is prevented.

While the embodiment herein shown and de scribed is admirably adapted to fulll the object primarily stated, it is to be understood that the invention is not to be limited thereto, since it may be embodied in other forms, all coming within the scope of the claims which follow.

What is claimed is:

1. A furnace tuyre block, comprising a relatively at body portion having an inlet end and a discharge end, a plurality of longitudinally extending ribs depending from said body portion defining a series of passages for draft air, delecting means provided at the ends of certain of said ribs, abutment means extending transversely of said body portion and arranged in spaced relation, said abutment means lying adjacent said deflecting means and dening inlet passages in alignment with said dei'lecting means, whereby the air flowing through said tuyre block is deflected toward said inlet end before entering the passages defined by said ribs.

2. A furnace tuyre block, 'comprising a relatively at body portion, a plurality of longitudinally extending ribs depending from said body portion dening a series of passages for draft air, deecting means provided at the ends of certain of said ribs, means providing a series of transversely disposed streamline abutments adjacent said deecting means, said abutment means lying in spaced relation and dening inlet passages therebetween in alignment with said deflecting means, and said defiecting means being transversely spaced providing inlet passages communicating with said passages defined by said ribs, said parts being so arranged that draft air passes between said abutment means and is deflected by said delecting means before entering the passages defined by said deiiecting means.

3. A furnace tuyre block comprising a relatively flat body portion having an air inlet end and an air discharge end, a pair of supporting members depending from the opposite sides of said body portion, a pair of ribs extending from the said discharge end toward the inlet end and terminating in an arcuate rib, said ribs diverging toward said inlet end and forming with said supporting members a pair of inlet passages for draft air, a plurality of longitudinally extending ribs disposed between said first mentioned ribs and said supporting members, deflecting means provided at one end of certain of said last mentioned ribs, a series of spaced members extending between said rst mentioned ribs and said supporting members, said spaced members being disposed adjacent said delecting means and forming inlet passages in alignment with said deflecting means, and said deiecting means being transversely spaced providing passages therebetween communicating with the said passages dened by said ribs, and said parts being so disposed that draft air passes between said members and is deflected by said deiiecting means before entering the passages between said dciiecting means and ribs.

4. A furnace tuyre block comprising a relatively flat body portion having an air inlet end and an air discharge end, means extending longitudinally of said body portion defining a series of passages for draft air, deecting means provided adjacent the inlet ends of certain of said rst mentioned means, a series of transversely disposed streamline abutments provided adjacent said deflecting means, said abutments lying in spaced relation and dening inlet passages therebetween in alignment with said deecting means, and said deflecting means being transversely spaced, defining communicating passages with said first mentioned passages, whereby the air flowing between said abutments is deected toward the air inlet end before entering said communicating passages, thereby causing turbulence and a reduction in the velocity of the air discharging from said tuyre block.

CLIFFORD E. HARRISON. 

